Measurement of the Melt Pool Length During Single Scan Tracks in a Commercial Laser Powder Bed Fusion Process
Measurement of the Melt Pool Length During Single Scan Tracks in a Commercial Laser Powder Bed Fusion Process
复制标题
DOI：
10.1115/1.4037571
复制
发表时间：
2018-05-01
影响因子：
4
通讯作者：
Lane, B. M.
中科院分区：
文献类型：
--
作者：
Heigel, J. C.;Lane, B. M.
本文介绍了在单道激光扫描镍合金625基片过程中熔池长度的高速热成像测量。使用商业激光粉末床裂变（PBF）机器进行扫描，同时使用高速（每秒1800帧）红外相机测量表面的辐射。熔池长度的测量是基于对温度曲线中明显的液固相线转变的检测。研究了编程激光功率（49-195 W）和扫描速度（200-800 mull）的七种不同组合，并使用各种扫描长度（4-12 min）进行了多次重复。结果表明，熔池长度达到稳定状态内的2分钟内开始的每一个扫描。熔池长度随激光功率的增加而增加，但其与扫描速度的关系不太明显，因为在最高激光功率195 W下进行的情况之间没有显著差异。虽然小孔似乎会影响熔池长度的预期趋势，但还需要进一步的研究。
This work presents high-speed thermographic measurements of the melt pool length during single track laser scans on nickel alloy 625 substrates. Scans are made using a commercial laser powder bed fission (PBF) machine while measurements of the radiation from the surface are made using a high speed (1800 frames per second) infrared camera. The melt pool length measurement is bused on the detection of the liquidus solidus transition that is evident in the temperature profile. Seven different combinations of programmed laser power (49-195 W) and scan speed (200-800 mulls) are investigated, and numerous replications using a variety of scan lengths (4-12 min) are performed. Results show that the melt pool length reaches steady-state within 2 nun of the start of each scan. Melt pool length increases with laser power, but its relationship with scan speed is less obvious because there is no significant difference between cases performed at the highest laser power of 195 W. Although keyholing appears to affect the anticipated trends in melt pool length, further research is required.